SR50 Sonic Ranging Sensor
Revision: 1/07
C o p y r i g h t © 1 9 9 5 - 2 0 0 7
C a m p b e l l S c i e n t i f i c , I n c .
Page 1: ...SR50 Sonic Ranging Sensor Revision 1 07 C o p y r i g h t 1 9 9 5 2 0 0 7 C a m p b e l l S c i e n t i f i c I n c...
Page 2: ...ther warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential...
Page 3: ...wo 21X Program Examples for Pulse Train Output 12 3 5 ASCII Output 18 4 Sensor Mounting and Installation 19 5 Data Interpretation 22 5 1 Measuring Snow Depth 23 6 Maintenance 23 7 Assembly Disassembly...
Page 4: ...Sonic Ranging Sensor Table of Contents ii Tables 1 SR50 SDI 12 Command List 9 2 Address Jumper Settings for Pulse Train and ASCII Outputs 19 Appendices A Making Concurrent Measurements with the SR50...
Page 5: ...to Assembly Disassembly Procedures on page 24 of the manual 3 Damage may occur to the transducer wires if the transducer assembly is not carefully orientated when fastening to the SR50 housing The tra...
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Page 7: ...Requirements 9 16 VOLTS D C Power Consumption 2 mA Quiescent 250 mA Measurement Peak Measurement Time 0 6 seconds typical 3 0 seconds max Output SDI 12 version 1 2 Serial ASCII 300 and 1200 Baud TTL o...
Page 8: ...e returning echoes that are reflected from the target The time from transmissions to return of an echo is the basis for obtaining the distance measurement Since the speed of sound in air varies with t...
Page 9: ...SDI 12 and ASCII options will output zeroes for distance to target and measurement quality numbers see below for description of quality numbers The Pulse Train option will output a single pulse Measu...
Page 10: ...clear anodize coating and attaching a bare section of stranded wire over the scraped area with a band clamp Copper wire and a stainless steel band clamp work best It is recommended to confirm with an...
Page 11: ...ut the distance to target in meters or feet include the measurement quality numbers and to include multiple target detection The 8 command outputs the first detected echo in meters as in the 0 command...
Page 12: ...ECORDER instruction description At present the CR10X CR510 and CR23X with recent OS have this ability More detailed instructions and a programming example is located in APPENDIX A CAMPBELL SCIENTIFIC...
Page 13: ...DI 12 Recorder P105 1 0 SDI 12 Address 2 1 Start Measurement aM3 code 1 is used SEE TABLE 1 3 1 Port Control Port 1 used for this example 4 2 Loc DEPTH Two input locations are used One for distance an...
Page 14: ...require for your data analysis 1 0 Minutes Seconds into a 2 60 Interval same units as above 3 10 Set Output Flag High Flag 0 9 Set Active Storage Area P80 1 1 Final Storage Area 1 2 60 Array ID This s...
Page 15: ...1 5 aM5 First Target Feet D1 Q1 with Quality Number 6 aM6 Multiple Targets Feet D1 D2 D3 7 aM7 Multiple Targets Feet D1 D2 D3 Q1 Q2 Q3 with Quality Numbers 8 aM8 First Target Meters D1 No Retries N A...
Page 16: ...urement when the Sensor Enable Line is pulsed high to 5 Volts The pulse width should be a minimum of 5 ms and a maximum of 250 ms in width When the SR50 detects that the Sensor Enable Line is high it...
Page 17: ...Always connect ground first followed by 12V and then the remaining SDI 12 Data Bus Sensor Enable Line and Shield In disconnecting the sensor the reverse order should be followed CAUTION Datalogger Col...
Page 18: ...gramming examples assume that the sensor is mounted 2 meters above the ground and the desired output is snow depth in meters In these examples a 21X micrologger is used to read the SR50 with the pulse...
Page 19: ...0 00 after the distance is calculated and stored for later processing and output 4 Pulse P3 1 1 Reps 2 1 Pulse Input Chan 3 00 Config Option 4 21 Loc Dis2Surf 5 0025 Mult 6 0 0 Offset Measure air tem...
Page 20: ...ter the distance to ground at your site 10 Z X F P34 1 21 X Loc Dis2Surf 2 2 00 F 3 10 Z Loc SnowDepth An hourly output example yours may vary 11 If time is P92 1 0 Minutes into a 2 60 Minute Interval...
Page 21: ...ses generated by the SR50 The number of pulses is dependent on the SR50 address setting and distance to target As configured from the factory Address 0 it will take 4 seconds to measure 10 meters Shor...
Page 22: ...Loc ATempComp 2 24 Z Loc ATempComp 7 Z X Y P36 1 21 X Loc Dis2Surf 2 24 Y Loc ATempComp 3 21 Z Loc Dis2Surf Add distance to ground to distance to snow which is negative to calculate snow depth In the...
Page 23: ...itation with Delay P22 1 1 Ex Chan 2 1 Delay w Ex units 0 01 sec 3 0000 Delay After Ex units 0 01 sec 4 0 0 mV Excitation 16 Set Port P20 1 0 Set Low 2 1 Port Number 17 Do P86 1 21 Set Flag 1 Low 18 D...
Page 24: ...lts The pulse width should be a minimum of 5 ms and a maximum of 250 ms Once the SR50 detects the Sensor Enable Line has gone high it makes a measurement When the measurement is finished the SR50 outp...
Page 25: ...et Meters 11 RS 232 300 BAUD First Target Meters 12 TTL 1200 BAUD First Target Meters 13 TTL 300 BAUD First Target Meters 14 RS 232 9600 BAUD Single Target Meters 15 Factory Test Mode 4 Sensor Mountin...
Page 26: ...x 1 inside diameter enables the SR50 to mount to any 3 4 pipe 1 outside diameter The SR50 s mounting stem also has 1 pipe thread to accommodate other threaded installation options Campbell Scientific...
Page 27: ...reading and output a zero as the distance to target If vibration is the concern it could be reduced by using guy wires on the mounting structure To improve the accuracy of the sensor readings it is be...
Page 28: ...the SR50 may not be able to obtain a reading One such example is snow of extremely low density In this situation the surface may not reflect enough sound for the sensor to detect The SR50 will output...
Page 29: ...s the distance to the surface that it is pointed at The sensor is mounted above and perpendicular to the surface To obtain snow depth the distance to snow must be subtracted from the distance to groun...
Page 30: ...t It is also recommended that the datalogger program be saved If possible do not open the SR50 in a field environment Do not remove the two Phillips screws which are countersunk the least The screws h...
Page 31: ...any more moisture Look through the small plastic window on the desiccant packs to inspect them 4 With a Phillips screwdriver remove the two screws that hold the aluminum end plate in place 5 Pull the...
Page 32: ...5 P10 LM2901N P2 P3 510 200K IN5231 Q3 R2 0033 F R3 S3 510 10 F IM 1 IM 1 01 F T3 U3 V3 V4 LT1020CN IM 1 1 X3 Y3 100 F T7 510 Q7 R7 R8 S8 S7 IN5231 0033 F 510 200K R11 S10 S11 T11 10K 1 8K 1 8K Y8 1 5...
Page 33: ...and aI where a address See Table 1 for list of all SDI 12 Commands The sensor will respond with a numeric signature If the signature is 63845 you have version 1 1 When using Concurrent Measurement opt...
Page 34: ...07 Temperature Probe is being used and that the SR50 SDI 12 DATA Bus line green wire is wired to control port 1 see Figure 2 page 6 for wiring diagram CR10X Table 1 Program 01 5 Execution Interval sec...
Page 35: ...than a pre determined number in this case 3 allow the 99999 to appear in the data to indicate that there is a problem with the measurement The pre determined number will depend on the scan rate and s...
Page 36: ...T 3 8 Z Loc DEPTH 20 Z X F P34 1 8 X Loc DEPTH 2 2 0 F Insertthedistancefromsensortobare ground 3 8 Z Loc DEPTH This is actual snow depth Hourly data output 21 If time is P92 1 0 Minutes Seconds into...
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